Standard vertical spindle drill presses of the fixed or radial head type are satisfactory for Lucite methyl methacrylate resin. Portable drills may be used, but even with special jigs they will not produce the most accurate results. Regular machine...

Below Cope's Bridge is a high hill (about 70 feet high) known as Deborah's Rock. Legend is that an Indian maiden jumped from the rock to the Brandywine to escape white man's attention. Historians claim it was named for Abiah Taylor's daughter,...

Modern 70 ton Heroult electric furnace, The hot raised electrodes are shown in white at the top. The cables at the right han side lead to the transformer house through which power is supplied to the electrodes

Standard vertical spindle drill presses of the fixed or radial head type are satisfactory for Lucite methyl methacrylate resin. Portable drills may be used, but even with special jibs they will not produce the most accurate results. Regular machine...

Oven drying of silicon at DuPont's new plant at Brevard, North Carolina. In this process, silicon needles are dried after a demineralized water wash. The Brevard plant has an annual capacity of 70,000 pounds of silicon a year. Silicon of ultra high...

This is one in a series of the first released wartime aircraft production photographs, showing the Boeing Aircraft Companys all out, 24 hour a day, seven day week effort to keep em flying. That this effort has succeeded is evidenced by the recent...

Letter from William du Pont to his secretary, Charles Lennig, concerning the large difference in his offer and the current owner's asking price for the Montpelier Estate. Du Pont authorizes Lennig to raise the offer to $70,000.

In addition to a moisture removal process, purity is a prime essential in the manufacture of Freon fluorinated hydrocarbon refrigerants and represents 70% of the process. Here a chemical operator at the Organic Chemicals Department's Chambers Works...